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One-to-many mapping in Hibernate is a relationship where one entity is associated with multiple instances of another entity. This is commonly used in scenarios like a cart system where one cart can have multiple items.
Example Scenario
Consider a cart system where we have a Cart entity and an Item entity. One cart can have multiple items, representing a one-to-many relationship. Here's how to implement this using JPA annotations in Hibernate.
Cart Entity
The Cart entity will have a collection of Item entities. We use the @OneToMany annotation to define this relationship.
import javax.persistence.*;import java.util.Set;@Entity@Table(name = "CART")public class Cart {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "cart_id")private long id;@Column(name = "total")private double total;@Column(name = "name")private String name;@OneToMany(mappedBy = "cart")private Set<Item> items;// Getters and setters}Item Entity
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